Improvements (Gen 1 & Gen 2)

Improved the performance and stability of apps on the center display.
In Navigation, improved the stability, usability, and responsiveness to touch gestures, such as swiping.
Fixed an issue that prevented the center display from responding properly to multi-touch gestures after streaming video content protected by Digital Rights Management (DRM). (Thanks, u/SnazzyLabs, for the report.)
Fixed an issue in Apple Music that prevented certain users from signing back into the app.
Enhanced steering calibrations for Sport and Off-Road drive modes to further optimize steering performance.
Sport drive mode: Maximized tire feedback and enhanced cornering precision.
Off-Road drive modes:
Reduced steering wheel kickback when you drive over rocky terrain.
Enhanced steering effort and damping to improve feedback during controlled rotation or drifting over gravel.
Improved steering torque feedback when you drive over loose surfaces and if wheel slip occurs.
NOTE All-Purpose, Snow, and Conserve drive modes remain unchanged.
Increased the availability of on-demand battery conditioning when the vehicle battery is low.
Fixed an issue that caused the “range is too low” notification to repeatedly appear during on-demand battery conditioning for DC fast charging.
Improved calibration to display the appropriate seat conditioning icon.
Improvements (Gen 2)

Enhanced perception upgrades the autonomous and active safety features on R1 Gen 2 vehicles.
Improved system performance when sensors are temporarily obstructed by snow, mud, or direct sunlight.
Improved detection and quicker reaction times to dynamic traffic conditions, such as cut-ins, merges, and stopped traffic.
Expanded vehicle detection across multiple lanes and in cross-traffic, with improved visualizations on the driver display.
Reduced number of system disengagements due to poorly marked lanes.
Improved cabin climate behavior in humid conditions. (Thanks, u/RivianTrackr, for the report.)
Increased the availability of on-demand battery conditioning when the vehicle battery is low.
Fixed an issue that caused the “range is too low” notification to repeatedly appear during on-demand battery conditioning for DC fast charging.
Fixed an issue that displayed inaccurate efficiency and energy consumption values for Trips A and B.
Improved calibration to display the appropriate seat conditioning icon.
Added a way to restart the vehicle to the Settings > Vehicle > Service screen.
Improvements (Gen 1)

Reduced active grille shutter noise from the front of the vehicle when it wakes from sleep.